SPIROGYRA 139 



82. Median spore wall double, outer 



wrinkled, inner punctate iiy. S. chun\ingensis 



82. Median spore wall single, finely 



scrobiculate 1 18. 5. orientalis 



83. Chromatophores 2, spores very irreg- 

 ularly reticulate wo. S. rhizopus 



83. Chromatophores 2-4, regularly retic- 

 ulate 1 19. 5'. subcylindrospora 



84. Zygospores ellipsoid 85 



84. Zygospores ovoid 92 



85. Chromatophores 2-3, diameter veg- 

 etative cells 34-37 M 120. iS. castanacea 



85. Chromatophores 2-3, diameter veg- 

 etative cells 42-48 yu. 121. S. mienningensis 



85. Chromatophores 3, diameter vegeta- 

 tive cells 46-52 M 122. S. shantungensis 



85. Chromatophores 3, diameter vegeta- 

 tive cells 50-60 /i 123. S. braziliensis 



85. Chromatophores 3-5 86 



86. Diameter vegetative cells mostly less than 55 /x 87 



86. Diameter vegetative cells mostly more than 55 /x 90 



87. Spore diameter mostly less than 54/A 88 



87. Spore diameter 48-64 /a, 4-3 (-2) chro- 

 matophores 124. S. pulchrifigurata 



87. Spore diameter 67-72 ju,, 3-5 chroma- 

 tophores 125. S. torta 



88. Median spore wall of a single layer 89 



88. Median spore wall double, outer 



wrinkled, inner punctate 126. S.quadrilaminata 



88. Median spore wall double, outer 



wrinkled, inner smooth 129. 5. subreticulata 



89. Median spore wall finely, irregularly 



reticulate, spore 38-60 /a x 64-100 /«.... 127. S.rhizobrachialis 



89. Median spore wall irregularly cor- 

 rugate, spores 37-41 /A X 48-65/4 128. S. paraguayensis 



90. Fertile cells cyUndric or enlarged 130. S. minor 



90. Fertile cells inflated 91 



91. Median spore wall intricately retic- 

 ulate 131. S. brunnea 



91. Median spore wall angularly punctate 132, S.scripta 



92. Fertile cells inflated 93 



